Inventions, Games, & Contraptions

"How to Make History Dates Stay"[manuscript & original drawings, 1899]

This essay with illustrations, describing Clemens's method of teaching historical dates to his children, was written in the summer of 1899 in Sweden, where the Clemenses had gone in search of treatment for their daughter Jean's epilepsy. It was published posthumously, as "How to Make History Dates Stick," in Harper's Monthly in December 1914.